We can use any of the above utilities to deal with relatively small files. What if we want to delete/remove a huge file/directory say of about 100-200GB. This may not be as easy as it seems, in terms of the time taken to remove the file (I/O scheduling) as well as the amount of RAM consumed while carrying out the operation.

In this tutorial, we will explain how to efficiently and reliably delete huge files/directories in Linux.

Suggested Read: 5 Ways to Empty or Delete a Large File Content in Linux

The main aim here is to use a technique that will not slow down the system while removing a huge file, resulting to reasonable I/O. We can achieve this using the ionice command.

Deleting HUGE (200GB) Files in Linux Using ionice Command

ionice is a useful program which sets or gets the I/O scheduling class and priority for another program. If no arguments or just -p is given, ionice will query the current I/O scheduling class and priority for that process.

If we give a command name such as rm command, it will run this command with the given arguments. To specify the process IDs of running processes for which to get or set the scheduling parameters, run this:

# ionice -p PID

To specify the name or number of the scheduling class to use (0 for none, 1 for real time, 2 for best-effort, 3 for idle) the command below.

This means that rm will belong to idle I/O class and only uses I/O when any other process does not need it: